Clenching device.



S. DERRINGER. .CLENCHING DEVICE.

APPLICATION FILED SEPT. 28, I9l5.

1,172,955. Patnted Feb. 22,1916.

2 SHEETS-SHEET l.

n r //////j S. DERRINGER.

CL-ENCHING DEVICE. APPLICATION FILED SEPT. 28, 1915.

Patented Feb. 22, 1916.

2 SHEETS-SHEET 2- wwss STEPHEN DEBRINGER, OI PHILADELFHIA, PENNSYLVANIA, .ASSIGNOR TO EMILY K. DIETZ, 0F PHILADELPHIA, IPENNSYLVANIA, TRADING UNDER THE FIRM-NAME OF DIETZ MACHINE WORKS.

GLENCHING DEVICE.

Speciflcation of Letters Patent.

Application filed September 28, 1915. Serial No. 53,073.

a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in Clenching Devices, of which the following is a specification.

One object of my invention is to provide a relatively simple and substantial device for automatically clenching the wire staple for holding together the layers or coils comprising a paper tube; the various parts being so arranged as to permit operation of the device at a high speed.

These objects and other advantageous ends I secure as hereinafter set forth, reference being had to the accompanying drawings in which:

Figure 1 is a side elevation, partly in section, illustrating the preferred form of my invention; Fig. 2 is a plan of the apparatus shown in Fig. 1; Fig. 3 is a transverse section of the winding mandrel with a tube thereon; Fig. 4 is a perspective view of the clenching anvil; and Figs. 5 to 8 inclusive are diagrammatic views illustrating the successive steps in the operation of my device.

It is tobe understood that the clenching device comprising this invention is primarily designed for use in connection with a tube making machine which, as it const i-- 'tutes no part of the present invention, is

not illustrated. Such a machine automaticallyhfeeds a rectangular sheet of paper, cardboard, or the like to a rotary mandrel 1 on which it' is wound into the form of a tube as having any desired number of layers or laminations. Thereafter a staple 2 of substantially U-shape form is driven into the tube radially thereof so as to permanently fasten the outer end of the paper roll to the body thereof with a view to preventing it unrolling. For the purpose of clenching the ends of this staple, I mount 1n a suitable recess of the mandrel abar 3, WhlCl'l with a block 4 of which it forms a part or to which itvis fixed, constitutes an anvil. Vith this idea in view the outer face of the bar has a centrally formed curved recess 5 and with the block 4 is movable longltudinally of the mandrel, either under the action of a plunger 6 pressed toward 1t by a spring 7 or by means of a rod 8 threaded into an opening 9 in said block.

Both the spring-pressed plunger and the rod are preferably concentric with the outer I surface of the mandrel and the spring with the plunger is held in place by a plug 10 screwed into the end of the mandrel op posite that entered by the rod 8. For longitudinally moving this rod-in the mandrel I mount on one of the rotary elements of the winding machine, in the present instance upon one side of a gear wheel 11, a cam 12 and support a lever 13 on a fulcrum pin 14, so that when a roller 15 at the end of one of the lever arms is acted on by said cam, an adjustable bolt 16 carried by its second arm will cause longitudinal movement of the rod 8. This bolt 16 is threaded through the second arm of the lever 13 and is retained in an adjusted position by a lock nut 17.

The finished tube is removed from the mandrel and the clenching operation is completed by any suitable form' of stripping mechanism such as an endless chain 20 and a forked tube engaging member 21 which extends partially around the mandrel in position to be moved longitudinally thereof by said chain.

The anvil 3-4 is normally held by the spring-pressed plunger 6 in such a position that when the staple 2 is driven through the tube w its ends strike the curved sides of the recess 5 in said anvil and are bent toward each other as illustrated in Fig. 5. Thereafter the cam 12 acts upon the lever 18 in such manner as to force the rod 8 into the mandrel 1, thereby moving the anvil in the direction of the arrow Fig. 6 and causing one of the fiat end surfaces of the bar 3 to engage one of the ends 2 of the staple so as to bend it parallel with and immediately adjacent the inner surface of the tube. This inner movement of the bar 8 and consequent sliding movement of the anvil is in opposition to the spring 7 so that as soon as the cam 12 releases the roller 15, said spring through the plunger 6, returns the anvil to its normal position, shown in Fig. 7. The forked stripper member 21 is so timed as to come into engagement with one end of the tube x, shortly after this action of the anvil, thereby sliding said tube longitudinally off-of the mandrel. In so doing however it forces the second end 2 of the staple 2 against the second flat surface of the outer edge of the bar 3 and said end turns also parallel and intoengagement with the inside surface of the tube at. As a Patented Feb. 22, 1916.

consequence the staple is perfectly clenched When the tube is finally stripped from the mandrel and the latter is insuitable position for the reception of another length of paper.

I claim:

1. The combination With a tube mandrel, of an anvil movable therein; means for moving the anvil to clench one prong of a staple in a tube on the mandrel; and means for moving the tube to clench the second prong of said staple.

2. The combination with a tube mandrel, of an anvil movable therein; and means for successively causing relative longitudinal motion of the tube and anvil to successively clench the prongs of a staple in opposite directions Within the tube.

3. The combination with a tube mandrel, of an anvil slidable therein; mechanism for moving said anvil in one direction longitudinally of the mandrel; and a spring for moving the anvil in the opposite direction.

4. The combination with a tube mandrel, of an anvil slidable therein; mechanism for moving said anvil in one direction; a spring for moving the anvil in the opposite direction; and a device for moving the tube on the mandrel to finish the clenching begun by the anvil.

5. The combination with a tube mandrel,

of an anvil slidable longitudinally thereof and having a clenching recess for the mandrel; mechanism for reciprocating the anvil t'o clench one prong of the staple in the tube on the mandrel; and means for stripping the tube from the mandrel to clench the otherprong of the staple,

6. The combination with a tube mandrel, of abar longitudinally slidable therein and having a staple receiving recess; a rod extending through the mandrel and arranged to operate on said bar; mechanism for positively moving said rod and bar in one direction; a spring for moving said rod and bar in the opposite direction; and a device for 'causing relative motion of the mandrel and the tube thereon to complete the clenching operation begun by the bar.

7. The combination with a tube mandrel, of a rod longitudinally movable therein; a recessed bar attached to said rod and slidprongs of a staple in the tube on said able in a cavity of. the mandrel; a spring- 

